LS CE-Chirp^® vs. Click in the neuroaudiological diagnosis by ABR

Area of Science:

• Neuroscience
• Audiology
• Biomedical Engineering

Background:

• The chirp stimulus aims to synchronize cochlear hair cell depolarization by compensating for sound wave travel time.
• This synchronization enhances neural synchrony and increases the amplitude of recorded auditory brainstem response (ABR) signals.

Purpose of the Study:

• To compare auditory brainstem response (ABR) parameters, including wave latencies, interpeak intervals, and wave V amplitude, between click and LS CE-Chirp® stimuli.
• To evaluate the potential diagnostic application of LS CE-Chirp® stimuli in neuroaudiology.

Main Methods:

• A cross-sectional study involving 30 individuals with normal hearing.
• Auditory brainstem response (ABR) was recorded using click and LS CE-Chirp® stimuli at 85dBnHL, with alternating polarity, a stimulus rate of 17.1/s, and 100-3000Hz filters.

Main Results:

• No significant differences were found in the absolute latencies of waves I, III, and V between the two stimuli.
• The LS CE-Chirp® stimulus elicited significantly higher amplitudes for wave V.
• Interaural latency differences for wave V showed no significant variation between stimuli.

Conclusions:

• LS CE-Chirp® stimulus is as effective as click stimuli for auditory brainstem response (ABR) assessment at high stimulation levels.
• The primary advantage of LS CE-Chirp® is its ability to generate larger amplitude wave V responses, aiding neuroaudiological diagnosis.